Consider the following linear programming problem: minimize the cost 3x1+x2+ 9x3+x4 subject to xi≥0 and x1+ 2x3+x4= 4 x2+x3−x4= 2 Write the Simplex tableau for this problem. Use elimination on the tableau to arrive at a tableau in which columns 1 and 2 comefrom the identity matrix. Which are the basic variables at this step of the Simplex method? What are their values? What is the corresponding cost?

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A: Therefore the 3rd option is correct

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